1. The lightbulb turned on when we let go of the string, then turned off when the washers hit the ground.

2. If we put 7 washers on the string, maybe the lightbulb will stay on for a shorter time, because the washers are heavier. And if the washers are heavier, it will take less time for the washers to get to the ground, therefore having less time for the lightbulb to turn on.

3. (Summary of the table.) The more washers that are on the string, the brighter the lightbulb will shine.

4. The bigger the number of washers on the string fall, the brighter and stronger the lightbulb is.

5. The washers falling, powering the motor, going through the wires, turning on the lightbulb.

6. (Summary of the table.) The more washers on the string fell, the more work was done by gravity.

7.The more washers on the string, the faster it falls, making more energy, makingthe lightbulb brighter.

8. You could put more washers on the string, or you could use less wires so the energy wouldn't have to travel so far.

9. Here are the steps.

1) Gather all your materials.

2) Set up all your materials.

3) Put 5 washers on the string.

4) Let them fall and time the fall.

5) After the fall, have someone mesuare the distance from the motor to the floor.

6) Then get the 5 washers and weigh them with a spring scale.

7) Now you should have 3 numbers. multiply the weight of the washers and the distance the washers fell together.

8) Now you should have 2 numbers. Take the number you got in the last step and multiply it by the amount of time you got. The number you got is the average power.

10.You could because you could connect the wires to the metal so the energy would go through the wires when the washers fall. The washers would fall, making energy and traveling through the wires. Then the energy would hit the metal, charging the lightbulb.